Combustible sedimentary rock composed primarily of carbon
Coal is a combustible black or brownish-black sedimentary rock , formed as rock strata called coal seams . Coal is mostly carbon with variable amounts of other elements , chiefly hydrogen , sulfur , oxygen , and nitrogen .[ 1]
Coal is a type of fossil fuel , formed when dead plant matter decays into peat which is converted into coal by the heat and pressure of deep burial over millions of years.[ 2] Vast deposits of coal originate in former wetlands called coal forests that covered much of the Earth's tropical land areas during the late Carboniferous (Pennsylvanian ) and Permian times.[ 3] [ 4]
Coal is used primarily as a fuel. While coal has been known and used for thousands of years, its usage was limited until the Industrial Revolution . With the invention of the steam engine , coal consumption increased.[ 5] In 2020, coal supplied about a quarter of the world's primary energy and over a third of its electricity .[ 6] Some iron and steel -making and other industrial processes burn coal.
The extraction and burning of coal damages the environment , causing premature death and illness,[ 7] and it is the largest anthropogenic source of carbon dioxide contributing to climate change . Fourteen billion tonnes of carbon dioxide were emitted by burning coal in 2020,[ 8] which is 40% of total fossil fuel emissions[ 9] and over 25% of total global greenhouse gas emissions .[ 10] As part of worldwide energy transition , many countries have reduced or eliminated their use of coal power .[ 11] [ 12] The United Nations Secretary General asked governments to stop building new coal plants by 2020.[ 13]
Global coal use was 8.3 billion tonnes in 2022,[ 14] and is set to remain at record levels in 2023.[ 15] To meet the Paris Agreement target of keeping global warming below 2 °C (3.6 °F) coal use needs to halve from 2020 to 2030,[ 16] and "phasing down" coal was agreed upon in the Glasgow Climate Pact .
The largest consumer and importer of coal in 2020 was China , which accounts for almost half the world's annual coal production, followed by India with about a tenth. Indonesia and Australia export the most, followed by Russia .[ 17] [ 18]
^ Blander, M. "Calculations of the Influence of Additives on Coal Combustion Deposits" (PDF) . Argonne National Laboratory. p. 315. Archived from the original (PDF) on 28 May 2010. Retrieved 17 December 2011 .
^ "Coal Explained" . Energy Explained . US Energy Information Administration . 21 April 2017. Archived from the original on 8 December 2017. Retrieved 13 November 2017 .
^ Cleal, C. J.; Thomas, B. A. (2005). "Palaeozoic tropical rainforests and their effect on global climates: is the past the key to the present?". Geobiology . 3 (1): 13–31. Bibcode :2005Gbio....3...13C . doi :10.1111/j.1472-4669.2005.00043.x . ISSN 1472-4669 . S2CID 129219852 .
^ Sahney, S.; Benton, M.J.; Falcon-Lang, H.J. (2010). "Rainforest collapse triggered Pennsylvanian tetrapod diversification in Euramerica". Geology . 38 (12): 1079–1082. Bibcode :2010Geo....38.1079S . doi :10.1130/G31182.1 .
^ Wilde, Robert (30 June 2019). "How the Demand for Coal Impacted the Industrial Revolution" . ThoughtCo . Retrieved 2 May 2024 .
^ "Global energy data" . International Energy Agency .
^ "Lignite coal – health effects and recommendations from the health sector" (PDF) . Health and Environment Alliance. December 2018. Archived from the original (PDF) on 11 December 2018. Retrieved 12 February 2024 .
^ Ritchie, Hannah ; Roser, Max (11 May 2020). "CO2 emissions by fuel" . Our World in Data . Retrieved 22 January 2021 .
^ Cite error: The named reference phys2018
was invoked but never defined (see the help page ).
^ "Dethroning King Coal – How a Once Dominant Fuel Source is Falling Rapidly from Favour" . Resilience . 24 January 2020. Retrieved 8 February 2020 .
^ "Analysis: The global coal fleet shrank for first time on record in 2020" . Carbon Brief . 3 August 2020. Retrieved 9 November 2021 .
^ Simon, Frédéric (21 April 2020). "Sweden adds name to growing list of coal-free states in Europe" . www.euractiv.com . Retrieved 9 November 2021 .
^ "Tax carbon, not people: UN chief issues climate plea from Pacific 'frontline' " . The Guardian . 15 May 2019.
^ Anmar Frangoul (27 July 2023). "IEA says coal use hit an all-time high last year — and global demand will persist near record levels" . CNBC . Retrieved 10 September 2023 .
^ Frangoul, Frangoul (27 July 2023). "Global coal demand set to remain at record levels in 2023" . iea . Retrieved 12 September 2023 .
^ "Analysis: Why coal use must plummet this decade to keep global warming below 1.5C" . Carbon Brief . 6 February 2020. Retrieved 8 February 2020 .
^ "Exports – Coal Information: Overview – Analysis" . IEA . Retrieved 20 January 2022 .
^ Overland, Indra; Loginova, Julia (1 August 2023). "The Russian coal industry in an uncertain world: Finally pivoting to Asia?" . Energy Research & Social Science . 102 : 103150. Bibcode :2023ERSS..10203150O . doi :10.1016/j.erss.2023.103150 . ISSN 2214-6296 .